docstr: Test that api call returns a csv-reader as requested
          
docstr_tok: ["Test","that","api","call","returns","a","csv-reader","as","requested"]
code: def test_time_series_intraday_extended(self, mock_request):
      """Test that api call returns a csv-reader as requested"""
      ts = TimeSeries(
          key=TestAlphaVantage._API_KEY_TEST, output_format="csv"
      )
      url = "https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY_EXTENDED&symbol=MSFT&interval=1min&slice=year1month1&adjusted=True&apikey=test&datatype=csv"
      path_file = self.get_file_from_url("mock_time_series_extended")
      with open(path_file) as f:
          mock_request.get(url, text=f.read())
          data, _ = ts.get_intraday_extended("MSFT", interval="1min")
          self.assertIsInstance(
              data,
              collections.Iterator,
              "Result Data must implement Iterator-interface",
          )
  
imports: from ..alpha_vantage.alphavantage import AlphaVantage
  from ..alpha_vantage.timeseries import TimeSeries
  from ..alpha_vantage.techindicators import TechIndicators
  from ..alpha_vantage.sectorperformance import SectorPerformances
  from ..alpha_vantage.foreignexchange import ForeignExchange
  from ..alpha_vantage.fundamentaldata import FundamentalData
  from pandas import DataFrame, Timestamp
  import unittest
  import sys
  import collections
  from os import path
  import requests_mock
label_desc: Use image node_id 9 for calling the TestAlphaVantage obj's underlying member method code with example usage: obj.test_time_series_intraday_extended(mock_request) without return types